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It seems like you'd get smoother, more accurate results if the in-feed side hole is larger than the desired out-feed size. Adjust the blade height to exactly line up with the bottom edge of the out-feed hole. Taper the tip a bit to start it and it should feed through nice and smoothly, with very little vibration on the other side since the exiting dowel very closely matches the guide hole. You might even pass it through a block of foam to be sure to dampen any vibration. At least, it works in my head. :) I'll have to give it a try tomorrow. Thanks for sharing!